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Stable Cu(I) complexes with thioamidoguanidine possessing halide-bridge structure.

Santosh K Sahoo1, Nilufa Khatun, Himanshu Sekhar Jena

  • 1Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India.

Inorganic Chemistry
|September 26, 2012
PubMed
Summary

Copper(II) halides react with unsymmetrical thiourea to form thioamidoguanidino complexes with Cu(I). A stable Cu(I) cluster forms when treated with copper(I) bromide, revealing diverse structural motifs in copper-sulfur-nitrogen chemistry.

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Area of Science:

  • Coordination Chemistry
  • Organometallic Chemistry
  • Materials Science

Background:

  • Thiourea derivatives are versatile ligands in coordination chemistry.
  • Copper halides are common precursors for synthesizing copper complexes.
  • Understanding the structural diversity of copper-thiourea interactions is crucial for developing new materials.

Purpose of the Study:

  • To investigate the reaction of aryl-sec-alkyl unsymmetrical thiourea with copper(II) and copper(I) halides.
  • To characterize the resulting copper complexes and clusters using single crystal X-ray diffraction.
  • To elucidate the structural differences and bonding modes in the synthesized copper compounds.

Main Methods:

  • Reaction of unsymmetrical thiourea with Cu(II)X(2) (X = I, Br) and Cu(I)X (X = Br).
  • Synthesis and isolation of copper complexes and clusters.
  • Single crystal X-ray diffraction analysis to determine molecular structures.

Main Results:

  • Treatment with Cu(II)X(2) yielded [Cu(2)(I)(μ(2)-X)(2)Tag(2)] complexes (A and B) with 1D chains, featuring either trans or cis orientations of thioamidoguanidino (Tag) units.
  • Treatment with Cu(I)Br formed a stable [Cu(I)(3)(μ(2)-S)(4)Tu(4)X(3)] cluster (C) with a Cu(I)(3)S(4)Br(3) core.
  • Structural analysis revealed differences in the Cu(2)X(2) core geometry (rhomboidal vs. bowl-shaped) and the coordination environment of copper centers.

Conclusions:

  • Unsymmetrical thiourea can be transformed into thioamidoguanidino ligands upon reaction with Cu(II) halides, leading to the formation of Cu(I) complexes.
  • The reaction pathway and resulting structures are dependent on the oxidation state of copper and the halide used.
  • The study highlights the rich structural chemistry of copper-thiourea systems, with potential implications for catalysis and materials science.